This technology introduces 1,1-diethoxyethane (DEE) as a solvent to replace or supplement conventional dioxolane (DOL) to enhance anode stability and suppress the polysulfide (PS) shuttle effect in lithium-sulfur batteries. Combining DEE with DME in a 20:80 to 80:20 volume ratio forms an optimized SEI layer.
Lithium-sulfur batteries have faced challenges with low electrical conductivity in sulfur cathodes and active material loss due to polysulfide dissolution in the electrolyte, leading to shuttle reactions. Furthermore, conventional electrolyte environments cause unstable lithium anode interfaces, resulting in dendrite growth, parasitic reactions, and short cycle life.
This technology utilizes an electrolyte composition of DEE and DME mixed in a 20:80 to 80:20 volume ratio. Due to the structural properties of DEE, a durable SEI layer with low Li2O content and high carbon/fluorine-based species forms on the anode surface. The electrolyte viscosity is controlled to suppress polysulfide migration and prevent parasitic reactions at the lithium anode. Applicable to lightweight lithium-sulfur cells for long-range drones, high-altitude UAVs, and aerospace, the simple design of adjusting the DEE ratio allows for balancing viscosity and ionic conductivity for specific applications.
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